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%I #2 Mar 30 2012 18:51:53
%S 0,2,4,6,8,19,39,59,79,99,299,499,699,899,1999,3999,5999,7999,9999,
%T 29999,49999,69999,89999,199999,399999,599999,799999,999999,2999999,
%U 4999999,6999999,8999999,19999999,39999999,59999999,79999999,99999999
%N Smallest number whose sum of digits is 2n.
%Y Cf. A051885.
%K nonn,base
%O 0,2
%A _Paul Curtz_, Oct 17 2007
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